Enable H.265 for iOS.

This issue also fixes some H.265 depacketizer issues for all platforms.

There are still some issues expected to be fixed later.

- H.265 only supported on iOS 11, iPhone 7 and later. Device and system
  check should be performed before calling H.265 APIs.
- Profile, tier and level are not correctly handled.
- QP is not enabled.

This change has been modified during rebasing since some C++ files already
been picked to 70-sdk branch.

Change-Id: Idf6087bae4f12432178b571ab76ab55127b66f5f
Reviewed-on: https://git-ccr-1.devtools.intel.com/gerrit/78608
Reviewed-by: Qiu, Jianlin <jianlin.qiu@intel.com>
Tested-by: Qiu, Jianlin <jianlin.qiu@intel.com>

sdk/BUILD.gn

@@ -445,10 +445,12 @@ if (is_ios || is_mac) {
         "objc/Framework/Classes/PeerConnection/RTCVideoCodec+Private.h",
         "objc/Framework/Classes/PeerConnection/RTCVideoCodec.mm",
         "objc/Framework/Classes/PeerConnection/RTCVideoCodecH264.mm",
+        "objc/Framework/Classes/PeerConnection/RTCVideoCodecH265.mm",
         "objc/Framework/Classes/PeerConnection/RTCVideoEncoderSettings.mm",
         "objc/Framework/Headers/WebRTC/RTCVideoCodec.h",
         "objc/Framework/Headers/WebRTC/RTCVideoCodecFactory.h",
         "objc/Framework/Headers/WebRTC/RTCVideoCodecH264.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoCodecH265.h",
       ]
       if (is_ios) {
         sources += [
@@ -982,6 +984,7 @@ if (is_ios || is_mac) {
           "objc/Framework/Headers/WebRTC/RTCTracing.h",
           "objc/Framework/Headers/WebRTC/RTCVideoCapturer.h",
           "objc/Framework/Headers/WebRTC/RTCVideoCodecH264.h",
+          "objc/Framework/Headers/WebRTC/RTCVideoCodecH265.h",
           "objc/Framework/Headers/WebRTC/RTCVideoFrame.h",
           "objc/Framework/Headers/WebRTC/RTCVideoFrameBuffer.h",
           "objc/Framework/Headers/WebRTC/RTCVideoRenderer.h",
@@ -1179,7 +1182,10 @@ if (is_ios || is_mac) {
       ]
       sources = [
         "objc/Framework/Classes/VideoToolbox/RTCVideoDecoderH264.mm",
+        "objc/Framework/Classes/VideoToolbox/RTCVideoDecoderH265.mm",
         "objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH264.mm",
+        "objc/Framework/Classes/VideoToolbox/RTCVideoEncoderH265.mm",
+        "objc/Framework/Headers/WebRTC/RTCVideoFrameBuffer.h",
       ]
 
       configs += [

sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodec+Private.h

@@ -11,6 +11,7 @@
 #import "WebRTC/RTCVideoCodec.h"
 
 #import "WebRTC/RTCVideoCodecH264.h"
+#import "WebRTC/RTCVideoCodecH265.h"
 
 #include "api/video_codecs/sdp_video_format.h"
 #include "common_video/include/video_frame.h"

sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodecH265.mm

@@ -0,0 +1,68 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/* This file is borrowed from
+ * webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCVideoCodecH265.mm */
+
+#import "WebRTC/RTCVideoCodecH265.h"
+
+#include <vector>
+
+#import "RTCVideoCodec+Private.h"
+#import "WebRTC/RTCVideoCodec.h"
+
+#include "rtc_base/timeutils.h"
+#include "system_wrappers/include/field_trial.h"
+
+static NSString* kH265CodecName = @"H265";
+// TODO(jianjunz): This is value is not correct.
+static NSString* kLevel31Main = @"4d001f";
+
+@implementation RTCCodecSpecificInfoH265
+@end
+
+// Encoder factory.
+@implementation RTCVideoEncoderFactoryH265
+
+- (NSArray<RTCVideoCodecInfo*>*)supportedCodecs {
+  NSMutableArray<RTCVideoCodecInfo*>* codecs = [NSMutableArray array];
+  NSString* codecName = kH265CodecName;
+
+  NSDictionary<NSString*, NSString*>* mainParams = @{
+    @"profile-level-id" : kLevel31Main,
+    @"level-asymmetry-allowed" : @"1",
+    @"packetization-mode" : @"1",
+  };
+  RTCVideoCodecInfo* constrainedBaselineInfo =
+      [[RTCVideoCodecInfo alloc] initWithName:codecName parameters:mainParams];
+  [codecs addObject:constrainedBaselineInfo];
+
+  return [codecs copy];
+}
+
+- (id<RTCVideoEncoder>)createEncoder:(RTCVideoCodecInfo*)info {
+  return [[RTCVideoEncoderH265 alloc] initWithCodecInfo:info];
+}
+
+@end
+
+// Decoder factory.
+@implementation RTCVideoDecoderFactoryH265
+
+- (id<RTCVideoDecoder>)createDecoder:(RTCVideoCodecInfo*)info {
+  return [[RTCVideoDecoderH265 alloc] init];
+}
+
+- (NSArray<RTCVideoCodecInfo*>*)supportedCodecs {
+  NSString* codecName = kH265CodecName;
+  return @[ [[RTCVideoCodecInfo alloc] initWithName:codecName parameters:nil] ];
+}
+
+@end